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Python | Nth Column vertical string in Matrix

  • Last Updated : 03 Oct, 2019

Sometimes, while working with Python Matrix, we can have a problem in which we need to access the Matrix in vertical form and extract strings from same, that too as a string, not merely as a list of characters. This task has it’s application in gaming in which we need to extract string during crosswords. Let’s discuss a way in which this task can be performed.

Method : Using list comprehension + join()
We achieve the task in this method in 2 steps. In 1st step the Nth column elements are extracted using list comprehension. In 2nd step, these elements are joined together to perform the characters to string conversion.

# Python3 code to demonstrate working of
# Nth Column vertical string in Matrix
# Using join() + list comprehension
# initializing list 
test_list = [('a', 'g', 'v'), ('e', 'f', 8), ('b', 'g', 0)]
# printing list 
print("The original list : " + str(test_list))
# initializing Nth column
N = 1
# Nth Column vertical string in Matrix
# Using join() + list comprehension
temp = [sub[N] for sub in test_list]
res = "".join(temp)
# Printing result
print("Constructed vertical string : " + str(res))
Output :
The original list : [('a', 'g', 'v'), ('e', 'f', 8), ('b', 'g', 0)]
Constructed vertical string : gfg

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